Heat-mass exchange system

ABSTRACT

The proposed heat-mass exchange system comprises a housing (1) with plates on whose blade are arranged turbulence contact elements comprising: a coaxially mounted cylindrical shell (4) with apertures (5) in the lower section and vertical slits (6) in the upper section; baffle (10); an overflow pipe (7); and a swirl vane (12). The novelty of the proposed heat-mass exchange system is the design of the blade in the form of a set of upwardly flanged shelves (2) along whose longitudinal axis are mounted a series of turbulence contact elements, while grooves (8) are fashioned around the circumference of the lateral edges underneath the intake sections of the overflow pipes (7) mounted therein; the blade of the plates is provided with longitudinal plates (3) secured between the flanges of the shelves (2) and in the grooves (9) formed in the intake sections of the overflow pipes (7) which protrude above the blade, while the longitudinal axes of abutting shelves (2) intersect at right angles. In addition, the swirl vanes of the contact elements are made together with the blade by stamping from the shelf (2) material and have an angle of attack of 10° to 45°. In addition, the contact element has the following geometric parameters: H=(0.5-3.0)D; d=(0.2-0.5)D, where H represents the height of the shell (4); D is the diameter of the shell (4); d is the diameter of the overflow pipe (7), the shell (4) being provided with an additional swirl vane (12).

This application is a 371 of PCT/RU/93/00181 Jul. 28, 1993.

The invention relates to the equipment to be used in the processes ofmass exchange, in particular to the heat-mass exchange systems.

BACKGROUND OF THE INVENTION

Heat-mass exchange systems for gas (steam) and liquid contact comprisinga housing with plates provided with turbulence contact elements areknown (see SU, A1, 182108, 1966; SU, A1, 572272, 1977; SU, A1, 301429,1987; SU, A1, 1398888, 1988; U.S. Pat. No. 4,237,426, 1980). Eachturbulence contact element in this system is provided with a separatingshell and a swirler giving an intensive phase contact due to rotatingmovement of the stream and its following separation.

However, these known systems operate effectively only in the narrowratio band of the phase rates because of the great possibility at highrates of the liquid overflooding or downfall and at low rates the liquidis being carried away.

Known too are heat-mass exchange systems comprising a housing withplates on whose blade are arranged turbulence contact elements providedwith coaxially mounted cylindrical shell with apertures in the lowsection and vertical slits in the upper section, a baffle, an overflowpipe and a swirl vane (see SU, A1, 580068, 1977). In this system swirledin the swirl vane gas (steam)being with contact with liquid incomingthrough the overflow pipe throws the liquid against the shell. Theliquid after the contact is withdrawn in different operating regimesthrough the apertures, vertical slits or circular gap between the shelland the baffle.

However, in this system the apertures of the greate diameter availablein the band of the plate for mounting in them the swirl vanes andoverflow pipes limit the quantity of the swirl elements arranged thereonand thereby influencing on the output of the system. In addition theknown systems have increased hydraulic resistance due to liquid streamincoming to the overflow pipe in turbulized condition.

SUMMARY OF THE INVENTION

The main object of the invention is improvement of the performance ofthe heat-mass exchange system owing to rigid construction of the bladeof the plate, providing arrangement on it a great number of the swirlvanes and creating laminar movement of the liquid stream in the overflowpipe.

According to the invention in the heat-mass exchange system comprisingthe housing with the plates on whose blade are arranged the turbulencecontact elements, the coaxially mounted cylindrical shell , the baffle,the overflow pipe with the apertures in the lower section and thevertical slits in the upper section, the blade are manufactured in formof a set of upwardly flanged shelves along whose longitudinal axis aremounted a series of the turbulent contact elements, while the groovesare fashioned around the circumference undernearth the intake section ofthe overflow pipes mounted therein; the blade of the plates is providedwith the longitudinal plates secured between the flanges of the shelvesand in the grooves formed in the intake section of the overflow pipeswhich protrude above the blade, while the longitudinal axis of theabutting shelves intersect at right angles. In addition the swirl vanesof the contact elements are made together with the blades by stamping ofthe shelves material and have an angle of attack of 10 to 45 degrees,and the shell and the overflow pipe are defined by the following ratioof geometric parameters:

    H=(0.5-3.0)D; d=(0.2-0.5)D

where H represents the hight of the shell

D is the diameter of the shell

d is the diameter of the overflow pipe

the shell is provided with the additional swirl vane.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention is illustrated by way of reference to the accompanyingdrawings, wherein:

FIG. 1 is a longitudinal cross section of the heat-mass exchange systemaccording to the present invention;

FIG. 2 is a cross sectional view taken on line A--A in FIG. 1;

FIG. 3 is a view of the shelves embodiment;

FIG. 4 is a sectional view of the upper section of the overflow pipeembodiment.

DESCRIPTION OF PREFERRED EMBODIMENTS

The heat mass-exchange system is provided with housing 1 in which plateshaving turbulent contact elements are arranged. The blade of the platesis made of the set connected with each other along the flanged upwardlyedges of the shelves 2 between which are arranged the longitudinalsecuring plates 3 that increase the rigidity of the structure. Theturbulent contact element includes the separating cylindrical shells 4coaxially mounted on the blade, in the lower section of which are theapertures 5 and in the upper section the vertical slits 6, the overflowpipes 7, the intake sections of which are secured in the grooves 8 ofthe shelves 2. The intake sections of the overflow pipes protrudingabove the blade have the grooves 9, the plates 3 are passed through andrigidly secured to the overflow pipes 7. The shell 4 is provided withthe baffle 10 mounted with a gap with regard to its upper face, theswirl device 11, made together with the blade by stamping of the shelves2 and additional swirl vane 12 arranged inside of the shell 4. For allthis the ratio of the height "H" of the shell 4 to its diameter "D" isof 0.5 to 3.0; the diameter "d" of the overflow pipe 7 is of 0.2 to 0.5of the diameter "D" of the shell 4, and the angle of attack of the swirldevices 11, 12 is choosen of 10 to 45 degrees.

The system operates in the following manner. The liquid from the bladeof the upper plate enters through the overflow pipe 7 in the contactelement for contacting with the gas (steam) flow turbulized by the swirldevice 11, which disperses the liquid, throwing it aganst the innersurface of the shell 4 and providing swirling movement. Under the actionof the centrifugal force the phase separation occurs on the shell 4,while the gas passes through the gap between the baffle 10 and theoverflow pipe 7 and enters from the intercontact space to the entranceof the swirl device 11 of the upper plate and the liquid being withdrawnin the intercontact space through the apertures 5 in the bubblingoperating regime (under increased liquid charges) and preferably throughthe lower section of the vertical slits 6 and the apertures 5 in thecombined operating regime; through the upper section of the verticalslits 6 and in the gap between the face of the shell 4 and the baffle 10with additional turbulization by the swirl vane 12 in the operatingregime of the phase inversion (under the increased gas charges) andenters through the overflow pipe 7 to contact elements of the belowarranged plate. Simultaneously the plates 3 arranged in the intakesections of the overflow pipes 7 "unswirl" the liquid flows, providingthem the laminar type of stream.

According to the invention the blade of the plate embodiment bringsabout to increasing of its rigidity due to the shelves connection by theadditional securing plates inserted in the grooves of the overflow pipesand between the flanged edges of the shelves, providing additionalfunction of the rigid ribs; the sections of the securing plates arrangedinside the overflow pipes provide unswirled type of the liquid stream,decreasing by this the hydraulic resistance and increasing the liquidcharge. The arrangement at right angle of the longitudinal axis of theabutting along the height of the plates brings about to assemble theplates of the standard shelves.

The proposed invention gives the opportunity to create simple, rigid andreliable embodiment of the heat-mass system of high out put in the wideband of the charges due to the special embodiment of the blade of theplate as the set of the flanged strips and chosen band of ratio of thegeometrical parameters of the swirl contact element.

The invention may be used in chemical and oil industries so as in theallied industries, where heat-mass exchange systems are in operation.

What we claim is:
 1. A heat-mass exchange system comprising a housingwith plates on whose blade are arranged turbulence contact elementsincluding coaxially mounted cylindrical shell with apertures in a lowersection and vertical slits in an upper section, a baffle, an overflowpipe and a swirl vane wherein the blade is manufactured in the form of aset of upwardly flanged shelves along which longitudinal axis aremounted in series the turbulent contact elements while grooves arefashioned around the circumference underneath to intake sections of theoverflow pipes mounted therein; the blade of the plates is provided withlongitudinal plates, secured between the flanges of the shelves and ingrooves formed in the intake sections of the overflow pipes, whichprotrude above the blade, while the longitudinal axis of the abuttingshelves intersect at right angles.
 2. The heat mass-exchange systemaccording to claim 1 wherein the swirl vanes of the contact elementsmade together with the blade by stamping of the shelves material andhave an angle of attack of 10 to 45 degrees.
 3. The heat mass-exchangesystem according to claim 1 wherein the contact elements are made withfollowing ratio of geomrtric parameters:

    H=(0.5-3.0)

    d:(0.2-0.5),

where H represents the height of the shell D is the diameter of theoverflow pipeand the shell being provided with an additional swirl vane.